One use only. Duration: One Phase. Can be activated during the opponent’s Siphon the Veil (Magic Phase, step 2): choose a Caster and select one of their spells (Bound or Learned): the chosen Caster cannot voluntarily cast the selected instance of this spell. E.g. if a caster has the same spell more than one time, only a single instance cannot be cast, and this has no effect on Magical Mishap